Nut-lock.



2N0. 728,560. v PATENTED MAY 19, 1903,

Y J. c. FOSTER.

NUT LOCK.

APPLICATION rmm JULY 5. 1902.

UNITED STATES Patented May 19, 1903.

PATENT OFFICE,

JOHN C. FOSTER, OF OLEVELAND,OHIO, ASSIGNOR OF ONE-HALF TO TERRY C. WHITNEY, OF CLEVELAND, OHIO.

NUT-LOCK.

SPECIFICATION forming part of Letters Patent N 0. 728,560, dated May 19, 1903.

Application filed July 5, 1902. Serial a. 114,517. (No modelJ To all whom it may concern:

Be it known that I, JOHN C. FOSTER, a citis zen of the United States, and a resident of Cleveland, in the county of Ouyahoga, State of Ohio, have invented certain new and useful Improvements in Nut-Locks, of which I hereby declare the following to be a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same. 7

My invention relates to improvements in nut-locks, and ,its objects are to provide a form of locking device by means of which the nut will be firmly secured to the thread of the bolt when it is attemped to unscrew it, but will readily screw onto the bolt.

My invention consists in the recessed nut and. a split gripping-nut insertedtherein, with the details of construction and combination and arrangement of parts as shown in the accompanying drawings and specifically-point- In the views, 1 is the bolt; 2, the head; 3,"

the screw-threaded portion. 4 is the large nut. permit the insertion of the small nut 6, which is split by a narrow slot? on one side, and a projection 8 is formed upon one side of the slot and is also upon the edge of the slot which is in advance as the nut is'screwed up, the edge 9 following being left without a projection. This projection fits into the radial slot 10 in the wall of the recess in the large nut.

In use it will be seen that when both nuts are placed upon the thread'of the bolt, the small one within the recess in the large one, both nuts can readily be screwed together down the bolt, but that when it is attempted to unscrew them the wall of the slot 10 in the Fig. 2 is pressure will serve to prevent turning it. Fig. at is a longitudinal Fig. 5 is Patent, is-

This hut is annularly recessed at 5 to large nut will engage the projection on the I 7 split nut and bend down that end of the ring against the thread of the bolt, thus compress- .ing it the more firmly as the greater is the effort to unscrew it.

The split nut is preferably formed of spring metahand when the end is compressed against the screw-thread of the-bolt it serves as a friction strap or brake, engaging more tightly thegreater the effort made to turn the nut. This device has the advantage that it can be unscrewed by a powerful wrench; but no jar or vibration, such as would be encountered by rolling-stock or in road-vehicles, would unscrew it.

The gripping-power of the split nut might be increased by sloping away the engaging side of the projection at 11 and the corresponding side of the slot 10 in the large nut, so as 'to present inclined planes whose Wedge action would compress the split nut strongly uponthe screw-thread.

The split nut is first tapped out about onesixteenth of aninch smaller than the thread of the bolt, so that it-will always have a grip upon the bolt, anda'slight increase in the Having described my invention, what I claim as new, and desire to secure by Letters In nut-locks, a threaded bolt, in combination'with a maiunut" having a recess in its side and a radial slot open thereto, and a split spring clamping-nut having a threaded'bore of less'diameter thanthe cross-section of said bolt, whereby whensaid nut is placed on the bolt it has to be sprungjopen and enlarged, I

and the said spring clamping-nut located in the recess of the main'nut and having a projection upon its outer edge engaged in the radial slot of the main nut, substantially as described.

7 JOHN o. FosrER. Witnesses:

WM. M. MONROE,

S. M. NEVI LE, R. ZBORNIK. 

